Answer Happy

Suppose the amount of time customers have to wait for their order at a coffee shop has an approximate normal distribution with a mean of 123 seconds and a standard deviation of 17.2 seconds. What is the z-score? Express the answer as a decimal value rounded to the nearest thousandth (three digits to the right of the decimal point).

Revisit the previous problem on the amount of time customers have to wait for their order at a coffee shop (the distribution is approximately normal). What proportion of the waiting times is shorter than the z-score you found? Express the answer as a decimal value rounded to the nearest thousandth (three digits to the right of the decimal point). You can earn extra credit for this problem if you upload a sketch to illustrate the solution. Be sure to take scale into consideration.